MCQ Psychiatry Answer 22

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For the purpose of treating seasonal affective disorder, the 10,000-lux fixture has been shown to be more effective and less time consuming that the 2500-lux fixture. This is the standard for initiating therapy. More portable head-mounted light visors have less proof of efficacy.


Sunscreen has been reported to be beneficial in patients with light-sensitive skin conditions. The benefit of light therapy appears to be mediated through the eyes. Significant retinal disease is considered a contraindication to therapy. Ophthalmologic evaluation is recommended if therapy is considered necessary.


Light therapy may be given in divided sessions. In order to encourage compliance, the therapy may be given at different times of the day. Patients with delayed sleep phase syndrome have benefited from morning therapy, while patients with advanced sleep phase syndrome have benefited from evening therapy.


Although clinical response may be seen after a few sessions, several weeks of therapy may be needed to see a full response. Therapy should not be abandoned after just 1 week because of lack of response.


Ref: Gabbard GO, Atkinson SD (eds): Synopsis of Treatments of Psychiatric Disorders, ed 2. American Psychiatric Press Inc, 1996, pp 543-546.


Category: Psychiatry MCQs

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